Electric alarm for



(No Model.)

F. GLASGOW.

ELECTRIC ALARM FOR TIME PIECES.

No. 352,407. Patented Nov. 9,1886.

' UNITED STATES PATENT OFFICE.

FRANK GLASGOW, OF OSCEOLA MILLS, PENNSYLVANIA.

ELECTRIC ALARM FOR TIME-PIECES.

.erncrrron'rroiv rel-111m part of Letters Patent No. 352,407, time November 9, 1886. Application filed May 1, 1886. Serial No. 200,827. (No model.)

u line was in Fig. 2:

Similar letters of reference indicate corre-- sponding parts in the different figures of the drawings.

The object of my invention is to provide an electric-alarm attachment to alarm-clocks to be operated by the alarm mechanism of the clock, so as to complete an electric circuitand sound an alarm electrically.

My invention consists of abase, upon which is mounted an ordinary alarm-clock carrying on the spring-arbor of its alarm mechanism a crank, and in the combination therewith of an electrical contact-lever resting in a notch in the base and held normally out of contact with the circuit-wire extending through the base, and a releasing-lever pivoted to the base and extending into the path of the crank on the spring-arbor of the alarm mechanism and arranged to release the contactlever from its notch in the base.

An ordinary alarm-clock, A, is mounted 011 the hollow base B, and upon the spring-arbor C of the alarm mechanism of the clock is supported an arborextension, D, which is apertured transversely and provided with a binding-screw, (0. I11 the aperture of the extension D is inserted an arm, E, having its free end aperturcd transversely to receive a pin, 1), which is clamped in the aperture in the arm by the set-screw c. As the alarm mechanism of the clock Ais of the, usual well known kind no further description of it will be required.

In the back of the base Bis formed a rightangled slot, (Z, in which is received the free end of a contact-levcr, e, the opposite end of g, as shown in dotted lines in Fig. 3.

which isjointed to an eye,f, projecting inward fromt-he front of the base B. The eye f is connected with the binding-post F at the end of the base, and to the binding-post G is secured a wire, which is stretched lengthwise across the base B, under the contact-lever e. To the back of the base B, above or near the right-angled slot d, and upon the screw 71, is pivoted the lever i, which is held with sufficient friction against the back of the base to prevent it from accidentally. turning. The lower and shorter arm of the leveri is opposite the horizontal portion of the rightangled slot d, and the upper and longer arm of the lever extends into the path of the pin I), carried by the arm E.

The spring of the alarm mechanism of the V clock is wound in the usual way by a key, or it may be wound by means of the arm E. The binding-posts F G are connected with a battery, j, and bell 7r, as indicated diagrammatically in connection with Fig. 1, and when the alarm is released by the clock in the usual way,and the arbor G revolves, the pin Z2 is carried round against the longer arm of the lever r; and turns the lever on its pivot, releasing the contactlever e from the horizontal part of the slot d, allowing it to drop down in the vertical part of the slot and make a contact with the wire The circuit being thus completed, thebell It will continue to ring so long as the lever e rests upon the wire 9.

The alarm may at any time be stopped by turning the leveri back into its original posi-' tion and replacing thelever ein the horizontal part of the slot (Z.

The alarm of an ordinary alarnrclock is limited as to time by the length of the spring, and it is frequently of such short duration as to be ineffectual. By the application of my improvement the alarm may be prolonged indefinitely and cannot be stopped without personal attention.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. The combination, with the alarm mechanism of an alarm-clock, of the arbor-extension D, the arm E and pin 1), lever "i, extending into the path of the pin 1), the contact-lever OUA SUI 6, arranged to be released by the lever t, the base B, extending into the path of the pin 11 IO contact-wire g, and the electrical connections, and adapted to engage the contact-lever e, and substantially as herein shown and described. the electrical connections, substantially as 2. The combination, with the alarm-clock herein described. 5 A, provided with the arbor-extension D, the

l L T arm n, and pin 7), ofthe base 13, provided with FRAIK GLASGO the right-angled notch d, the wire g, stretched Witnesses: across the base, the contact-lever e, placed J OHN BRATTEN,

above the wire 9, the lever 2 pivoted to the 1 ROBERT TAYLOR. 

